How do I change/create boot drive to same drive that Linux Mint filesystem is installed?

So I originally started on Windows 10 and made the switch to Linux Mint. I installed Mint (filesystem) on my M2 drive (Samsung 970 EVO). Windows (and my boot drive in BIOS) is my SSD (Samsung 860 QVO). Somehow, I also have a boot option on another SSD (Sandisk) that I think I accidentally created when first installing Mint. Now I want to reformat the windows drive, so I tested unplugging that drive and seeing if I could boot Mint. However I don't seem to be able to do so with the boot options available.

So I am wondering if I am able to add a boot option for Mint to my M2 drive that has my Mint filesystem? That way I can reformat the SSD, and if possible remove the Sandisk boot options. Here is a picture of my drives, and here is a picture of my boot options.